IB Business Management SLTopic 5 — Operations ManagementPaper 1 & 2Core idea~12 min read
Job, Batch, Mass and Flow Production
A wedding dress and a bottle of shampoo are both made by a business, but nothing about how they are made is the same. One is made once, by hand, for one person. The other is made a hundred thousand times an hour by a machine that never changes its mind. Choosing between those extremes is one of the biggest decisions an operations manager makes.
📚 What you need to know
There are four main production methods: job, batch, flow (mass) and mass customisation.
Job production makes one item at a time to a customer’s own specification.
Batch production makes a group of identical items, finishes them, then starts the next batch.
Flow production makes identical items continuously along a production line.
Mass customisation gives customers choices within a standardised, flow-style process.
As volume rises, cost per unit falls but flexibility falls too. That is the central trade-off.
The right method depends on output required, the nature of the product, how standardised it is, and how automated the business can afford to be.
The trade-off in one picture
The four methods are not a ranking from worst to best. They sit on a spectrum, and moving along it means gaining one thing and giving up another.
Read down a column and you have a summary of that method. Read across a row and you have the trade-off.
Job production
One product, made from start to finish, to meet the specific requirements of one customer. Nothing is made until somebody orders it.
What it looks like: a wedding dress, a made-to-measure kitchen, an architect’s design, a hand-built piece of jewellery, a bespoke software system.
✓ ADVANTAGES
Products are fully customised, so the business can meet needs nobody else is serving.
That usually supports a premium price and strong customer loyalty.
High attention to detail, because each item is checked as it is made.
Very flexible — the business can change what it makes almost immediately.
✗ DISADVANTAGES
High cost per unit, because there are no economies of scale to be had.
Long lead times, which loses customers who want something quickly.
Needs skilled labour, who are expensive and hard to replace.
Hard to manage — every order needs close contact with the customer to get right.
Notice that “skilled labour” appears as a disadvantage here and as an advantage in a different question. It costs more, but it is also why the business can charge more. If you can explain both sides of a single fact, you are writing at the top level.
Batch production
A quantity of identical items is made together and goes through the whole process before the next batch starts. Change the recipe or the setting, and you get a different batch.
What it looks like: bread baked in trays, a run of medicine tablets, a colour of paint, a season’s run of a clothing design.
✓ ADVANTAGES
The business can switch between batches and serve different customer needs from one set of equipment.
Cheaper per unit than job production, since materials are bought in larger quantities.
A quality fault can be caught within one batch before the next begins.
Some purchasing economies of scale become available.
✗ DISADVANTAGES
Setting up between batches takes time, and the machines sit idle while it happens.
Batches create stock, which needs storing and can spoil or go out of date.
Less adaptable than job production if a customer wants something unique.
Frequent starting and stopping puts extra wear on equipment.
Batch is the compromise method. If a question describes a firm that needs variety but cannot afford one-off production, batch is very often the answer the examiner is looking for.
Flow (mass) production
The product moves continuously along a line, and each workstation performs one specific task. It never stops, and every item that comes off the end is the same as the last.
What it looks like: canned drinks, cars, consumer electronics, packaged food.
Its four features are worth learning as a set: division of labour (each station does one job), standardisation (identical products), continuous movement (no idle time), and automation (machines do the repetitive work).
✓ ADVANTAGES
Very low cost per unit, because the fixed costs are spread over huge output.
Almost no set-up or idle time, so efficiency is high.
Labour costs are lower — automation means fewer highly skilled workers are needed.
Short lead times, so orders can be filled quickly.
Consistent quality, because any deviation shows up immediately.
✗ DISADVANTAGES
Needs huge capital investment in machinery before a single unit is sold.
If one part of the line breaks down, everything stops, and downtime is expensive.
Only suited to standardised products, so customisation is impossible.
Depends on a steady supply of materials, so any supply problem halts production.
Repetitive work can demotivate staff, raising turnover and absenteeism.
Mass customisation — having it both ways
Mass production gives low costs but no choice. Customisation gives choice but high costs. Mass customisation tries to sit in the overlap: a standardised, efficient process that still lets the customer pick options.
Think of ordering a car: you choose the model, the trim and a few extras, but every one of those options was designed in advance so the line can still run.
It works because of three things: a standardised base product, technology such as computer-aided design and flexible machinery, and a fixed menu of options rather than unlimited freedom.
✓ WHY BUSINESSES DO IT
Customers get something close to what they wanted, so satisfaction and loyalty rise.
The business keeps most of the economies of scale of flow production.
It can respond to changing tastes by changing the option list, not the factory.
It is a genuine way to differentiate from rivals selling identical products.
✗ WHAT IT COSTS
Heavy investment in flexible machinery and design software up front.
Variable costs are higher than for a purely standardised product.
More complex to schedule, since no two units on the line are quite the same.
Lead times are longer than for something taken off a shelf.
The four methods side by side
Method
Volume
Cost per unit
Customisation
Typical example
Job
One at a time
High
Complete
A made-to-measure suit
Batch
Groups
Medium
Between batches only
A tray of bread; a run of paint
Flow / mass
Continuous, very high
Low
None
Canned drinks; electronics
Mass customisation
High
Low to medium
From a fixed menu
A car built to a chosen spec
Choosing a method
🧩 Four questions that decide the answer
How much output is needed? Large, steady demand points towards flow.
What is the nature of the product? Perishable, fragile or complex products may rule flow out.
Standardised or customised? If every customer wants something different, job or batch.
How much automation can it afford? Flow production needs capital the business may simply not have.
A quick rule for recommendation questions: if the case study says customers buy on price, argue towards flow production and low unit costs. If it says they buy on quality or individuality, argue towards job or batch. Then use a number from the text to prove which one it is.
Worked examples
WE 1
Define the term “batch production”
Define the term “batch production”. [2]
Answer
Batch production is a method in which a set quantity of identical products is made together, ✓
completing every stage of the process before the next batch is started. ✓the second half is the bit students leave out, and the bit worth the second mark.
WE 2
Explain one advantage and one disadvantage of flow production
Case study: Calder Drinks bottles a single flavour of sparkling water for supermarkets, which buy on price. It runs one filling line producing 18,000 bottles an hour. Last year a conveyor fault stopped the line for two days and it missed a large order. It has no spare line and its bottles come from one supplier.
Explain one advantage and one disadvantage to Calder Drinks of using flow production. [4]
Advantage
Flow production spreads Calder’s fixed costs over 18,000 bottles an hour, so its cost per bottle is very low, which matters because its supermarket customers buy on price. ✓✓
Disadvantage
The whole operation depends on one line, so when the conveyor failed production stopped completely for two days and a large order was missed — a risk made worse by having only one bottle supplier. ✓✓
the 18,000 figure and the two-day stoppage are doing the application work.
WE 3
Recommend a production method (10 marks) — outline
Case study: Thornfield Ceramics hand-throws pottery to order. Each piece takes a potter about three hours and sells for a high price to customers who value the fact it is unique. Demand has doubled in a year and the workshop now has a fourteen-week waiting list. The owners have $180,000 available and are considering switching to batch production of a small standard range.
Recommend whether Thornfield Ceramics should switch to batch production. [10]
Paragraph 1 — define and link
Job production makes one item at a time to a customer’s order; batch production makes groups of identical items. Thornfield currently uses job production and is considering moving one step along the spectrum.
Paragraph 2 — the case for switching
A fourteen-week wait is losing sales, and batch production would let the same four potters produce far more per week by repeating one design instead of setting up for each piece. Cost per item would fall and the $180,000 could fund a larger kiln.
Paragraph 3 — the counter-argument
However, customers are paying a premium precisely because each piece is unique. Standardising the range removes the thing they are buying, so Thornfield could cut its waiting list and its prices at the same time.
Paragraph 4 — a middle option
A partial switch may be stronger: batch-produce a small standard range for people who will not wait fourteen weeks, while keeping commissioned pieces as job production for the premium customers.
Paragraph 5 — conclusion with limitations
On balance the split approach fits best, because it protects the premium brand while capturing the demand currently walking away. The case study does not give the price difference between commissioned and standard pieces, or how many customers give up during the fourteen-week wait, and both would decide how large the batch range should be.
the middle option is what lifts this answer. Real operations decisions are rarely all or nothing.
💡 Exam tip
Ask what the customer is buying. Price points to flow; individuality points to job. The case study always tells you which.
Use the volume-cost-flexibility trade-off as your structure. It gives you an advantage and a counter-argument in one move.
Check whether the firm can afford the switch. Flow production needs capital, and the case study usually tells you how much cash there is.
Consider a partial change. Keeping two methods side by side is a genuinely strong recommendation.
Mention motivation when discussing flow production. Repetitive work affects staff turnover, which is a real cost.
Name the method you are recommending explicitly, and say why the alternatives are weaker.
⚠ Common mix-up
Thinking batch means “several at once by hand”. Batch means the whole group completes each stage before the next batch starts.
Confusing mass customisation with job production. Mass customisation offers a fixed menu of options; job production starts from a blank page.
Saying flow production is always cheapest. It is only cheap once volumes are high enough to cover the machinery.
Ignoring set-up time in batch production. The idle time between batches is a real cost and a common exam point.
Assuming job production means poor efficiency. It means low volume, but the premium price can make it very profitable.
Recommending flow production for a small firm with no capital. Always check what the business can actually afford.
Forgetting supply risk. Flow production with one supplier is a single point of failure.
Up next: Using SWOT Analysis — the first tool in the Business Management Toolkit, and the one that helps a firm decide which of these operations choices fits its situation.
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